diff --git a/src/DBR.sol b/src/DBR.sol
index aab6daf..0781c97 100644
--- a/src/DBR.sol
+++ b/src/DBR.sol
@@ -107,8 +107,10 @@ contract DolaBorrowingRights {
  107, 107:     @return uint representing the total supply of DBR.
  108, 108:     */
  109, 109:     function totalSupply() public view returns (uint) {
- 110     :-        if(totalDueTokensAccrued > _totalSupply) return 0;
- 111     :-        return _totalSupply - totalDueTokensAccrued;
+      110:+        unchecked {
+      111:+            if(totalDueTokensAccrued > _totalSupply) return 0;
+      112:+            return _totalSupply - totalDueTokensAccrued;
+      113:+        }
  112, 114:     }
  113, 115: 
  114, 116:     /**
@@ -121,7 +123,7 @@ contract DolaBorrowingRights {
  121, 123:         uint debt = debts[user];
  122, 124:         uint accrued = (block.timestamp - lastUpdated[user]) * debt / 365 days;
  123, 125:         if(dueTokensAccrued[user] + accrued > balances[user]) return 0;
- 124     :-        return balances[user] - dueTokensAccrued[user] - accrued;
+      126:+        unchecked { return balances[user] - dueTokensAccrued[user] - accrued; }
  125, 127:     }
  126, 128: 
  127, 129:     /**
@@ -134,7 +136,7 @@ contract DolaBorrowingRights {
  134, 136:         uint debt = debts[user];
  135, 137:         uint accrued = (block.timestamp - lastUpdated[user]) * debt / 365 days;
  136, 138:         if(dueTokensAccrued[user] + accrued < balances[user]) return 0;
- 137     :-        return dueTokensAccrued[user] + accrued - balances[user];
+      139:+        unchecked { return dueTokensAccrued[user] + accrued - balances[user]; }
  138, 140:     }
  139, 141:     
  140, 142:     /**
@@ -256,7 +258,7 @@ contract DolaBorrowingRights {
  256, 258:     @notice Function for invalidating the nonce of a signed message.
  257, 259:     */
  258, 260:     function invalidateNonce() public {
- 259     :-        nonces[msg.sender]++;
+      261:+        unchecked { nonces[msg.sender]++; }
  260, 262:     }
  261, 263: 
  262, 264:     function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
diff --git a/src/Fed.sol b/src/Fed.sol
index 1e819bb..b57b444 100644
--- a/src/Fed.sol
+++ b/src/Fed.sol
@@ -121,7 +121,7 @@ contract Fed {
  121, 121:         uint marketValue = dola.balanceOf(address(market)) + market.totalDebt();
  122, 122:         uint supply = supplies[market];
  123, 123:         if(supply >= marketValue) return 0;
- 124     :-        return marketValue - supply;
+      124:+        unchecked { return marketValue - supply; }
  125, 125:     }
  126, 126: 
  127, 127:     /**
diff --git a/src/Market.sol b/src/Market.sol
index 9585b85..293bbb6 100644
--- a/src/Market.sol
+++ b/src/Market.sol
@@ -518,7 +518,7 @@ contract Market {
  518, 518:     @notice Function for incrementing the nonce of the msg.sender, making their latest signed message unusable.
  519, 519:     */
  520, 520:     function invalidateNonce() public {
- 521     :-        nonces[msg.sender]++;
+      521:+        unchecked { nonces[msg.sender]++; }
  522, 522:     }
  523, 523:     
  524, 524:     /**
